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| Effect of Microbial Inoculum on Denitrifying Bacterial Communities in Cow Manure Compost |
| Received:November 06, 2014 |
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| KeyWord:natural compost;microbes-inoculated compost;maturity;denitrifying bacterial population;denitrifying bacterial diversity |
| Author Name | Affiliation | E-mail | | XU Ying-ying | College of Resources and Environment, Northeast Agricultural University, Harbin 150030, China | | | XU Xiu-hong | College of Resources and Environment, Northeast Agricultural University, Harbin 150030, China | xuxiuhong@neau.edu.cn | | REN Guang-ming | College of Resources and Environment, Northeast Agricultural University, Harbin 150030, China | | | SUN Yu | College of Resources and Environment, Northeast Agricultural University, Harbin 150030, China | | | LI Hong-tao | College of Resources and Environment, Northeast Agricultural University, Harbin 150030, China | |
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| Abstract: |
| Aerobic composting is an effective method to dispose solid organic wastes. In this study, cow manure with rice straw was used to investigate the effect of lignocelluloses-degrading microbial inoculum on denitrifying bacterial communities. Composting maturity was assessed by temperature, pH, C/N, seed germination index(GI), NH4+-N and NO3--N contents. Both natural and microbes-inoculated composts were completely mature, with the inoculated compost more mature than natural one. Microbial inoculation decreased denitrifying bacterial population, but increased the diversity of nosZ-denitrifying bacterial community. The similarity of natural compost samples ranged from 50% to 75%, while that among microbe-inoculated samples was between 27% and 76%, indicating an accelerated succession of denitrifying bacterial communities by inoculated microbes. NosZ-denitrifying bacteria in compost included γ-proteobacteria, β-proteobacteria, uncultured bacteria and α-proteobacteria. Microbes-inoculated compost contained some denitrifying bacteria taxas that were not present in the natural compost. These taxas were Halomonas, Azospirillum, Paracoccus, Herbaspirillum and Alcaligenes. Among them, the final denitrifying product of Alcaligene and Paracoccus was N2, thus decreasing N2O emissions. |
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